db2gse.ST_AsText takes a geometry object and returns its well-known text representation.
语法
db2gse.ST_AsText(g db2gse.ST_Geometry)
返回类型
Varchar(4000)
示例
在以下方案中,db2gse.ST_AsText 函数将 HAZARDOUS_SITES 位置点转换成它的文本说明:
CREATE TABLE HAZARDOUS_SITES (site_id integer, name varchar(40), location db2gse.ST_Point); INSERT INTO HAZARDOUS_SITES VALUES (102, 'W. H. Kleenare Chemical Repository', db2gse.ST_PointFromText('point (1020.12 324.02)', db2gse.coordref()..srid(0))); SELECT site_id, name, cast(db2gse.ST_AsText(location) as varchar(40)) "Location" FROM HAZARDOUS_SITES;
SELECT 语句返回以下结果集:
SITE_ID Name Location ------- ------------------------------------ ---------------------------------------- 102 W. H. Kleenare Chemical Repository POINT (1020.00000000 324.00000000)